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    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script>
        //手机
        function Phone(brand,price){
            this.brand=brand;
            this.price=price;
        }
        Phone.prototype.call=function(){
            console.log('我可以打电话！！');
        }

        //智能手机
        function SmartPhone(brand,price,color,size){
            Phone.call(this,brand,price);
            this.color=color;
            this.size=size;
        }
        //设置子级构造函数的原型
        SmartPhone.prototype=new Phone;
        SmartPhone.prototype.constructor=SmartPhone;

        //声明子类的方法
        SmartPhone.prototype.phopo=function(){
            console.log('我可以拍照');
        }
        const chuizi=new SmartPhone('锤子',2499,'黑色','5.5inch');
        console.log(chuizi);
    </script>
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